Method and apparatus for producing bags



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METHOD AND APPARATUS FOR PRODUCING BAGS Filed April 22, 1955 4 Sheets-Sheet l INVENTOR.

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METHOD AND APPARATUS FOR PRODUCING BAGS Filed April 22, 1955 4 Sheets-Sheet 2 INVENTOR. 14/. LA RD EHA H/V.

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Aug. 5, 1958 Filed April 22, 1955 United States Patent NIETHOD AND APPARAggJS FOR PRODUCING Willard E. Hahn, Pensacola, Fla., assignor to St. Regis Paper Company, New York, N. Y., a corporation of New York Application April 22, 1955, Serial No. 503,191

8 Claims. (CI. 9314) This invention relates to bags, and more particularly to single or multi-ply bags of the non-gusseted satchel bottom type, the bottoms of which are formed in such a way that when each is opened it is squared, that is, all of the corners thereof are substantially of 90. The invention also relates to a method and apparatus for producing such a bag.

One of the objects of the present invention is to provide a novel non-gusseted satchel bottom type bag and method and apparatus for producing same, which bag is somewhat similar in its squarable qualities to the known self-opening type of gusseted bag but which because of its non-gusseted satchel type bottom is substantially cheaper and easier to manufacture in volume.

Another object is to provide a novel bag of the above character which has superior strength characteristics as compared to such self-opening style gusseted bag of the prior art.

A further object is to provide a novel method for manufacturing the aforementioned bag which is extremely simple and which is well adapted to mass production techniques.

The invention in one aspect thereof is constituted by a non-gusseted single ply or multi-ply pasted-end bag of the satchel bottom type, the satchel bottom end closure of which comprises a pair of inturned end flap portions adjoining, a long diagonal fold lines of a pair of side flap portions which are folded in along base fold lines to overlap and overlie such end flaps. Each bag is provided with four side corner score lines which are to form the longitudinal corners of the sides of the opened bag. Two pairs of such side corner score lines, when the bag is flattened, are situated along opposite longitudinal margins or side edges thereof and parallel to such side edges. Each pair of such side corner score lines is spaced from its nearer and respective bag side edge a distance which is equal to one-half of the width of the aforementioned satchel bottom and the four side corner score lines are formed in such a manner that the convexity of each protrudes outwardly of the bag. The two parallel side edges of the bag when fiat comprise side edge fold lines, the portions of the bag adjacent thereto expanding in response to the opening of the bag about such side edge fold lines. Each bag bottom is further provided with two bottom width score lines, otherwise known as end flap corner score lines, one on each end flap of the bag bottom. Each end flap corner score line is in alignment with its respective side corner score line when the bag bottom is flat and substantially in the plane of the body of the bag. Such end flap corner score lines become substantially co-planar with and perstituted by the aforementioned novel method for manufacturing bags of the above character, which method consists in the steps of forming two pairs of parallel longitudinally extending score lines in one or a plurality of continuous webs, the score lines of each pair being spaced a distance equal to the desired width of the satchel bottom of the bag and positioned for forming said side corner score lines of the finished bag. The two lines comprising each of such pairs thus are situated on opposite sides of the line about which the webs are to be folded by a tube forming device. Thereafter the web supply is formed into a flattened tube with the score lines of each such pair thereof in face-to-face, aligned and adjacent relation, the aforementioned longitudinally extending score lines therebyforming the side corner score lines, each pair of such lines being along its respective bag tube side margin and the convexities of the score lines protruding outwardly of the bag tube. Thereafter the flattened bag tube is separated into bag lengths comprising bag tube blanks and there is formed in a bottom region of each of the bag tube blanks a bottom main score line which is positioned transversely of the end region thereof and spaced from and parallel to an end edge of the bag tube blank. There is formed, preferably but not necessarily substantially contemporaneously with the bottom main score line, two relatively short score lines which are positioned intermediate the aforementioned end edge and said main score line, one of such short score lines being formed in each of the opposite side marginal areas thereof. Such two short score lines, if desired, may be formed by suitable score means situated in the tuber, preferably after the folding of the web into a tube and before the severance thereof into bag tube lengths. The two short score lines are in alignment with one another and each extends perpendicularly from its respective side edge to its adjacent and respective side corner score line, thereby being parallel to the aforementioned bottom main score line. The perpendicular distance between such short score lines and said main score line is equal to the perpendicular distance between a side corner score line and its adjacent side edge when the bag is in a flattened condition. The aforementioned short score lines comprise end flap corner score lines or bottom width score lines. end of each bag tube blank is opened and spread preferably in substantially flat condition thereby forming and spreading two bag bottom side flaps and two bag bottom end flaps, each end flap having its aforementioned end flap corner score line formed therein, which, having now shifted is in alignment with its respective side corner score line in response to the bag bottom being pressed into substantially the same plane with the body of the bag. A pair of parallel base fold lines thereafter is formed in each of the spread ends. Each base fold line extends between and the length thereof is determined by corresponding termini of the aforementioned parallel end flap score lines. Thereafter adhesive is applied'to selected areas of each spread tube end and the side flaps thereof are folded one over the other, thereby to complete the bag bottom.

Various, further and more specific objects, features Thereafter the 3 and advantages of the invention will clearly appear from the detailed description given below taken in connection with the accompanying drawings which form a part of this specification and illustrate, by way of example, a preferred form of the bag and preferred arrangements of apparatus and method steps for carrying out the invention. The invention consists in such novel-bag and methods and combinations of features, method steps and apparatus as may be shown and described herein.

In the "drawings:

Fig. 1 is a perspective view showing schematically one form of bag tubing machine which can be employed in the present invention and also showing certain scoring means employed therewith;

Fig. -2 is a side view of a portion of the bag tubing machine shown schematically in Fig. l, the parts shown in Fig. 2 showing particularly the position of the scoring means;

Fig. 3 is a side elevation on an enlarged scale of a scoring unit employed in the tuber of Figs. 1 and 2;

Fig. '4 is a front elevation of one of the scoring units shown in side elevation in Fig. 3, it being understood that there are four such scoring units employed in the present invention, the scoring wheels or rolls thereof being disposed as shownin Fig. 1;

Fig. 5 is a perspective view of certain transverse scoring means which are employed for scoring the bag tube blanks formed on the tuber of Fig. l, and which scoring means may be employed in a bag bottomer machine wherein the bag tubes move lengthwise thereof;

Fig. '6 is a perspective view of a bag tube blank scoring device for forming scores upon each bag tube blank similar to those formed by the device of Fig. 5 but adapted for use in a bag bottomer wherein the bag tubes move sidewise 'therethrough instead of lengthwise, as in Fig. 5;

Figs. 7a to 7f illustrate sequentially the steps in the formation of a bag bottom from a bag tube blank in accordance with one form of the present invention, the bag tube blank moving lengthwise through the bag bottomer;

Fig. 8 is an enlarged fragmentary view of a finished bag bottom embodying one form of the present invention, the bag bottom being in a flattened condition substantially in alignment with the plane of the bag body;

Fig. 9 is a perspective view of a bag bottom embodying the present invention, the bag and its bottom being in an open condition;

Fig. 10 is anenlarged view of a corner of the bag tube blank during an intermediate stage in the formation of the bottom thereupon and comprises an enlargement or the upper righthand portion of Fig. 7b; and

Fig. 11 comprises an enlargement of the upper right- 'hand corner of thebag bottom shown in Fig. 7d.

Referring to'the drawings in greater detail, with particular referenceto'Figs. 1-8, the novel method for forming the bag bottom embodying the present invention 'will now be described.

Reverting to Fig. 1, a multi-ply bag tubing machine or bag tuber is shown to which, in a conventional manner, a plurality of webs 21, 22 and 23,-are fed and brought together at a suitable web assembly region 24a,

thereby to form a 'multi-ply web 24.

Themulti-ply web 24 is scored in a manner well illustrated 'in Fig. 1 in 'four locations, thereby to produce the longitudinally extending score lines 25, 26 and 27,

28 and respectively formed by scoring units 29-32, inclusive. The latter scoring units are so disposed to form said score lines 28 wherein each pair of score "handiFi fU fold line of the bag tube, which fold line is indicated at 33 and which comprises one side edge of the finished bag. The other pair of score lines, 27, 28 are analogously situated with respect to a center line therebetween which is to become a fold line 34 (Fig. l) which comprises the opposite side edge of the bag tube.

The assembled composite web 24 after being so scored as above described, is directed into a tube former 35 of conventional design where it is folded into a tube generally designated 36, which latter tube is separated into bag lengths by means of a bag tube cutting device 37, also of conventional design. A suitable pair of draw rolls 38, 39 are provided in advance of the cutter 37 for a well known purpose and a pair of bag length separator rolls 40, 41 are provided on the opposite side of the cutter 37 for aiding in separating the bag lengths after being cut away from the tube 36. A sample bag length (or bag tube blank) 42 is shown in Fig. 1 on a conveyor 43. The bag tube blank 42 of bag length thus is formed having the two score lines 25, 26 on the left side (Fig. 1) in face-to-face aligned relationship, and similarly the other two score lines 27, 28 are in face-to-face aligned relationship. The convexities of the score lines 2628, inclusive, protrude outwardly of the bag tube.

The perpendicular distance between the score lines 25, 26 is equal to the width of the bottom of the proposedbag, and the same is true, of course, with respect to the other pair of score lines 27, 28.

Referring to Figs. 1 and 2, it will be seen that the positions of the several scoring rolls 29-32, inclusive, are preferably in advance of a web supporting roll 44 over which there may be situated a seam paste unit 45 of conventional design for the purpose of applying lines of adhesive to one of the margins of the composite web 24.

If desired, the edges of the webs 21, 22 and 23 may be offset with respect to one another in a well known manner whereby the longitudinal seams of the several webs are relatively staggered, thereby assisting in forming a staggered longitudinal seam when the webs are folded over by the tube former 35.

The web 24 is directed into the tube former 35 by suitable means (not shown) including guide Wheels and rolls of conventional design.

The degree to which the scoring means 2932 form the scores in the web 24 can be controlled by means of a hand adjustment device comprising a handle 46 for angularly shifting a shaft 47, the latterbeing frictionally held in a desired angular position by means of a collar shaped clamp 48 having an adjustable 'bolt 49 (Fig. 3),

' the clamp 48 comprising a collar which is suitably held against angular movement as by a bolt 50 (Fig. 4) which passes through the collar of clamp 48 and is secured in the frame 51 of the tubing machine.

The scoring units 2932 are each mounted for rotation upon a suitable arm, one of which is shown at 52, for example, for the scoring means 32, the arm 52 being rigidly secured to the shaft 47 and having a bifurcated portion 52a betweenwhich is supported a scoring wheel or roll 53, the periphery of which is adapted for scoring cooperation with a peripheral groove 54 formed in scoring wheel 55. The wheel 55, and the other four like it for the other scoring devices, are mounted rotatably upon a suitable shaft 56' which is preferably rigidly held between supports in the aforementioned frame 51.

Reverting now to Figs. 7 and 8, the several steps in the formation of the bag will now be described with respect to a given tube blank, such as the aforementioned bag length 42.

The bag tube blank 42, after being discharged by the tuber 20 of Fig. 1, thereafter isintroducedinto a bag bottomer and may proceed therethrough lengthwise, that is,.moving in the direction of the longitudinal axis of such bag tube blank.

example of a bag bottoming device which may be employed for this purpose is shown in United States patent to A. Potdevin No. 1,176,163, granted March 21, 1916, and also No. 1,775,829, granted to the same inventor September 16, 1930. In the latter two patents, the bag tube blanks or bag lengths move in the direction of the longitudinal axis of the blanks through the machine.

Alternatively, the bag tube blanks can be bottomed, if desired, by means of a bag bottomer, as shown in United States Patent No. 2,570,047, granted to Edwin E. Burroughs October 2, 1951, or by means of the apparatus shown in copending U. S. patent applications Serial No. 422,575 or 493,135, which issued as Patent No. 2,753,769, inventor Edwin E. Burroughs. It is understood, of course, that any of the bottomers disclosed in the aforementioned patents or applications are to be modified as disclosed herein in order to carry out the present inventions.

In describing the formation of the bag bottom in con 'nection with Fig. 7, the bag bottom on only the righthand end of the bag tube blank will be described, it being understood, of course, that a bag bottom on the opposite extremity can be similarly formed, if desired, by the bag bottoming apparatus. In the bag bottomers shown in the granted patents aforementioned, a bag bottom is formed first on one end and after that is completed, the bag bottom is formed on the other end. How- .ever, if the apparatus as disclosed in the copending patent applications is employed, the two bag bottoms are formed simultaneously by duplicate sets of bag bottoming apparatus, one on each side of the bag bottomer while the bag tube blanks are moved sidewise through the bottomer.

v Referring now to Fig. 7a, there is formed in the end of each bag tube blank a pair of parallel slits 57 which are perpendicular to the end edge 58 of the bag tube blank. It will be seen that the score lines 25, 26 are superimposed or are situated in face-to-face aligned relationship comprising side corner score lines (Fig. 7a), the same being true with respect to the score lines 27, 28.

I The purpose of the slits 57 is, of course, well known in the manufacture of satchel bottom bags and is principally for the purpose in aiding in increasing the area to which adhesive may be applied thereby increasing the strength of the bag bottom. However, the invention is not limited to satchel bottom bags having such slits and embraces in fact the manufacture of so-called full diamond types of bag bottoms where no slits, such as 57, are employed, and alternatively embraces bottoms formed with substantially shallower slits than shown at 57.

Thereafter the critical score lines are formed, as shown in Fig. 7b, reference particularly being had to the relatively short score lines 59 and 60 which are formed in their respective opposite side marginal areas of the bag tube blank and which extend each perpendicular to its respective side edge and to its respective side corner score lines 25,26 and 27, 28. However, such score lines 59, 60, as aforementioned, may be formed by scoring means (not shown) on the tubing machine.

The relatively short score lines 59 and 60 are referred to as:

(a) Bottom Width score lines; or (b) End flap corner score lines.

The score lines 59 and 60 preferably are formed substantially simultaneously with the formation of a main score line 61 which extends transversely of the bottom region of the bag tube blank, as well shown in Fig. 7b, the score lines 59 and 60 being situated intermediate the score line 61 and the end edge 58.

" The invention is not limited in its method, apparatus or article aspects to a main score line 61, it being possible to form a bag bottom without it providing suitable means 6 are employed for forming the bottom along a bottom main line which is located similarly .to such score line.

The function of the relatively short score lines 59 and 60 will appear more fully hereinafter with special reference to Fig. 9, wherein, for example, the score line 59, when the bag is opened, spreads out into double the length shown in Fig. 7b and forms the end flap corner score line. The same, of course, is true of the score line 60 on the other end of the same bottom.

One example of apparatus for substantially simultaneously forming the end flap corner score lines 59, 60 and the bottonrmain score line 61 is shown in Fig. 5 and comprises a scoring bar 62 mounted upon opposite discs 63 and 64 which are rotatable upon a shaft 65. The bar 62 extends uninterruptedly from the disc 63 to 64 and is rigidly secured thereto. A pair of relatively short scoring blades 66 and 67 are mounted, as shown in this figure, for the. purpose of forming respectively the relatively short score lines 59 and 60 (end flap corner score lines) in cooperation with a slotted bar 68 having a pair of slots 69 and 70 for cooperating respectively with the blades 66 and 67. A long scoring blade 71 is also mounted in the scoring bar 62 for the purpose of forming the main score line 61 in cooperation with a long slot 72 also formed in the slotted bar 68.

Thereafter the tube end or the extremity of the bag tube blank is opened and spread, as shown in Fig. 7c, wherein there are formed a pair of opposite flaps 73, 74 and a pair of end flaps 75, 76.

It will be noted that the opening and spreading of the tube end causes the end flap corner score lines 59 and 60 respectively to be shifted and spread apart wherein they are placed in alignment with their respective side corner score lines 25, 26 and 27, 28, each of the end flap corner score lines being thus spread out into double its original length, as is well shown not only in Fig. 70 but also in Fig. 11.

It is, of course, understood that the bag bottom in the intermediate stage of manufacture, as in Fig. 7c, is fiattened so that it is in, or substantially in, the plane of the main body of the bag, although, of course, the bag tube blank may be curved about a forming drum wherein the bag tube bottom and the body of the bag would follow substantially the same cylindrical surface.

Thereafter, as shown in Fig. 7d, there are formed transversely of the bag tube bottom a pair of additional score lines 77 and 78 comprising base fold score lines and about each of which the side flaps 74 and 75 are folded as will appear hereinafter.

The base fold score line 77 is situated between corresponding opposite termini of the end flap corner score lines 59 and 60 and thus in Fig.'7d is situated between the point 59:: and 60a respectively comprising the left extremities of the score lines 59 and 60. Thus the base fold score line 77 is determined in length by such corresponding opposite termini.

The base fold score line 78 is analogously determined as to its length between the points 5911 and 6% which are respectively the right extremities of the score lines 59 and 60.

In Fig. 7e there is shown adhesive applied to the open and spread bag bottom parts, such application of adhesive being in a well known manner.

Thereafter the side flaps 73 and 74 are folded one over the other and the bag bottom is completed as in Fig. 7

If desired, the application of the paste to the spread bag tube bottom in Fig. 7e may be done in such a way that a valve opening is allowed to remain, for example, in the upper portion of the bottom, as viewed in these figures, it being understood, of course, that the opposite extremity of the bag tube blank is fully bottomed without a valve opening therein. I

In the formation of the critical score lines 59 and 60 and also the score line 61, it will be observed, with particul'ar reference to Fig. 10, that the distance between, for example, the score lines 59 and 61, as measured perpendicula'rly, is equal to the distance between side edge 79 and the side corner score lines 25, 26. Consequently, as is well shown in Fig. 10, the quadrilateral described between the points 80, 81, 82 and 83 is a true square.

Referring'to Figs. 7c, 8 and 10, when the end flap 75 is formed by opening and spreading the tube end, there are formed the diagonal fold lines 84 and 85 which, prior to the opening and spreading of the tube end, of course, are non-existent. However, such diagonal fold lines extend along a straight line extending between points 82 and 57a of Fig. 10, the latter being the innermost extremity of the nearer slit 57.

If the bag tube blanks are bottomed in the bag bottomer shown in the aforementioned copending U. S. patent application Serial No. 493,135, a scoring apparatus for forming the end flap corner score lines 59, 60 and the main score line 61 may be employed, as shown in Fig. 6, which is similar to that shown in the Burroughs copending United States patent application Serial No. 472,057 with the exception of the employment of an additional scoring bar 84. The latter is parallel to and reciprocates with a main scoring bar 85. The additional scoring bar 84 has secured thereto relatively short scoring blades 86 and 87 for forming the aforementioned end flap corner score lines 59 and 60. The long score 61 and the short score 61a are formed respectively, with the aid, of course, of slotted and mating reciprocating bars 88 and 89. It is, of course, understood that the bag tube blanks 42 proceed sidewise through the bottomer in the latter type of machine, by being pulled, for example, by the clamps 90 and 91 secured to sprocket chains. Clamps 90, 91 grasp the leading edge of the bag tube blank 42 and pull same through the bottomer.

Referring again to Figs. 8 and 9, it will be seen that the bag bottom of Fig. 8, after it has been opened, presents the configuration shown in said Fig. 9 wherein the bottom is fully squared and a transverse or a longitudinal cross-section of the bottom region will also be squared although in the form shown of a generally rectangular form. However, it is, of course, within the purview of the invention to form any shape of squared bottom having right angles at the corners thereof as shown in Fig. 9. The convexities of the side corner score lines and 26 (Fig. 9) protrude outwardly of the bag and also that the side fold 33 along the side thereof is formed with a convexity that also protrudes outwardly of the bag.

One of the important features of the novel bag employed herein is that it achieves substantially all of the advantages of the self-opening style of gusseted bags but can be manufactured substantially more cheaply and with greater ease. Furthermore, the novel bag of Fig. 9 is of substantially greater strength as compared to the aforementioned self-opening style of bag for the following reasons:

The operations upon the side corner lines in the present invention comprises scores and not folds, that is, along the lines 25 and 26 score lines are formed which in the self-opening style in lieu thereof comprise fold lines due to the gusseted nature of such latter type. The degree of the deformation of the fibres of the bag along the lines 25 and 26 and, of course 27, 28 is thus substantially less than in gusseted bags or as in any other type of bag of the prior art and the same is true with respect to the end flap corner score line (bottom width score line) 59. In view of the lesser degree of deformation of the fibres along these lines, a superior degree of strength is attained by this bag and its likelihood of failure along such lines is substantially lessened.

Furthermore, there is provided a novel article, as in Fig. 9, which is of superior saleability due to the easily squared bottom which enhances the qualities of the container for such purposes as baler bags which are adapted for receiving a plurality of smaller bags. Furthermore, valve bags may be manufactured employing the invention as above set forth which are somewhat similar to the aforementioned self-opening style of bag with respect to the filling characteristics but which further give the squareness of appearance to a filled bag which is of substantial desirability from a commercial and sales point of view because of the superior stacking qualities of the bag and also because of the aforementioned greater strength.

If desired, a tubing machine may be employed embodying the apparatus shown in the U. S. patent granted to Potdevin No. 1,176,164 or No. 2,028,145, modified as set forth herein.

If desired, a supplemental sheet or sleeve can be applied to one of the corners of the spread and open tube end, as is well shown in the aforementioned copending application Serial No. 493,135, now Patent No. 2,753,769, whereby a valved pasted satchel bottom bag is produced.

There is thus provided a novel bag which is of the satchel bottom type and which is capable of opening to a square or parallelepiped configuration, the bag being, of course, of the non-gusseted type and being of low manufacturing costs and of high ease of manufacture particularly under mass production conditions. The bag in either single or plural ply form is particularly well suited for use as a baling bag into which a number of smaller filled bags may be inserted. I

Furthermore, in view of the formation in the bag of Fig. 9 of mere score lines, as at 25 and 26 and 59, instead of fold lines, the greater strength of the article produced is also a result of the fact that the fibres of the paper have not been compelled to take a permanent set as they would normally so be compelled if folded. Furthermore, in the manufacture of prior art bags, for example, of the self-opening gusseted style, the side corners of the bag are subjected to press rollers along fold lines along all three of the lines analogous to 25, 33 and 26 of Fig. 9.

What is claimed is:

1. In the manufacture of bags having satchel bottoms of a selected width, the steps of: forming two pairs of parallel longitudinally extending score lines in a web, the score lines of each pair being spaced apart a distance equal to such width of the satchel bottom of the bag and parallel to one another and positioned for forming side corner score lines of the finished bag; forming the web so scored into a flat tube with the score lines of each such pair thereof in face-to-face aligned relation thus forming such side corner score lines along opposite side margins of such flat tube, the convexities of said score lines protruding outwardly of the flat tube; just prior to separating such tube into bag tube lengths forming transversely of the end region of such fiat bag tube two relatively short score lines intermediate the location of a tube end edge and that of a bottom main line, the latter being near to but spaced from an end edge of the tube, one such short score line being in each of the opposite side marginal regions of the flat tube, such short score lines being in alignment with one another when the tube is flat and each extending perpendicularly from its respective side edge to its adjacent and respective side corner score line, the perpendicular distance between each said short score line and said bottom main line when the tube is flat being equal to the perpendicular distance between a side corner score line and its adjacent side edge of the bag tube, said short score lines comprising end flap corner score lines; opening and spreading to a substantially flat condition such end region of such tube thereby forming and spreading two bag bottom side flaps and two bag bottom end flaps; forming a pair of parallel base fold score lines in said spread end, each base fold score line extending between and the length thereof being determined by corresponding termini of said end flap corner score lines; applying adhesive to selected areas of said spread tube end; and folding said side flaps over one an- 9 other each along its respective base fold score lines thereby to form the bag bottom, the convexities of said base fold score lines being formed for protruding outwardly of the finished bag bottom in response to opening and squaring the latter.

2. In the manufacture of multi-ply bags having satchel bottoms of a selected width, the steps of: forming two pairs of parallel longitudinally extending score lines in each of a plurality of continuous webs, the score lines of each pair being spaced apart a distance equal to said width of the satchel bottom of the bag and parallel to one another and positioned for forming side corner score lines of the finished bag; forming the multi-ply web so scored into "a flattened tube with the score lines of each such pair thereof in face-to-face aligned relation thus forming side corner score lines along opposite side margins of the bag tube, the convexities of said score lines protruding outwardly of the bag tube; thereafter separating the flattened tube into bag length comprising bag tube blanks; forming a bottom main score line transversely of theend region of each bag tube blank and spaced from and parallel to the end edge thereof, and substantially simultaneously therewith also forming transversely of the end region of each bag tube blank two relatively short score lines intermediate said end edge and main score line, one such short score line being in each of the opposite side marginal areas thereof, such short score lines being in alignment with one another and each extending perpendicularly from its respective side edge to its adjacent and respective side corner score line, the perpendicular distance between said short score lines and said main score line being equal to the perpendicular distance between a side corner score line and its adjacent side edge of the bag tube blank, said short score lines comprising end flap corner score lines; opening and spreading to a substantially flat condition such end of each such tube blank thereby forming and spreading two bag bottom side flaps and two bag bottom end flaps, each end flap having as aforementioned an end flap corner score line therein which after such spreading is in alignment with its respective side corner score line; forming a pair of parallel base fold score lines in each of said spread ends, each base fold score line extending between and the length thereof being determined by corresponding termini of said parallel end flap corner score lines; applying adhesive to selected areas of each of said spread tube ends; and folding said side flaps of each bottom over one another, the convexities of said base fold score lines being formed for protruding outwardly of the finished bag bottom in response to opening and squaring the latter.

3. In the manufacture of bags having satchel bottoms each of a selected width, the steps of forming two pairs of parallel longitudinally extending score lines in a continuous web supply the score lines of each pair thereof being spaced apart a distance equal to the aforementioned width of the satchel bottom of the bag and positioned with respect to said web supply for forming outwardly protruding side corner score lines of the finished bag; forming the web supply so scored into a flattened tube with the score lines of each pair thereof in face-toface aligned relation with the concavity of one line of such pair in face-to-face relation with the concavity of the other of such pair, each such pair of score lines forming the aforementioned side corner score lines along its respective bag tube side margin, thereafter separating the flattened tube into bag lengths, each length comprisa bag tube blank; forming a bottom main score line transversely of the end region of each bag tube blank and spaced from and parallel to the near end edge thereof, and substantially simultaneously therewith also forming transversely of the end region of each bag tube blank two relatively short score lines intermediate said nearer end edge and main score line, one such short score line being formed in each of the opposite side marginal areas thereof, said short score lines being inalignnient with one another and each extending perpendicularly from its respective side edge to its adjacent and respective side corner score line, said short score lines being parallel to said main score line, the perpendicular distance between each of said short score lines and said main score line being equal to the perpendicular distance between a side corner score line and its adjacent side edge, said short score lines comprising end flap corner score lines; opening and spreading substantially flat such end of each such tube blank thereby forming and spreading two bag bottom' side flaps and two bag bottom end flaps, each end flap having its aforementioned end flap corner score line formed therein in alignment with its respective side corner score line in response to such spreading flat; forming a pair of parallel base fold score lines in each of said spread ends, each base fold score line extending between and the length thereof being determined by correspond. ing termini of said parallel end flap score lines; and thereafter folding said side flaps one over the other, the con vexities of said base fold score lines being formed for protruding outwardly of the bag bottom in response to opening and squaring the latter.

4. In the manufacture of multiply bags having satchel bottoms each of a selected width, the steps of forming two pairs of parallel longitudinally extending score lines in each of a plurality of continuous webs, the score lines of each pair thereof being spaced apart a distance equal to the aforementioned width of the satchel bottom of the bag and positioned with respect to said webs for forming outwardly protruding side corner score lines of the finished bag; forming the multi-ply web so scored into a flattened tube with the score lines of each pair thereof in face-to-face aligned relation, each such pair of score lines forming the aforementioned side corner score lines along its respective bag tube side margin, thereafter separating the flattened tube into bag lengths, each comprising a bag tube blank; forming transversely of the end region of each bag tube blank two relatively short score lines a preselected distance from and parallel to an end edge of the bag tube blank, one such short score line being formed in each of the opposite side marginal areas thereof, said short score lines being in alignment with one another and each extending perpendicularly from its respective side edge to its adjacent and respective side corner score line, said short score lines being parallel to a bottom main line about which said bottom is formed, the perpendicular distance between each of said short score lines and said main line being equal to the perpendicular distance between a side corner score line and its adjacent side edge, said short score lines comprising end flap score lines; opening and spreading substantially flat such end of each such tube blank thereby forming and spreading two bag bottom side flaps and two bag bottom end flaps, each end flap then having its aforementioned end flap score line formed therein in alignment with its respective side corner score line; forming a pair of parallel base fold score lines in each of said spread ends, each base fold score line extending between and the length thereof being determined by corresponding termini of said parallel end flap score lines; and thereafter folding said side flaps one over the other, the convexities of said base fold score lines being formed for protruding outwardly of the bag bottom.

5. In the manufacture of bags having satchel bottoms of a selected width, the steps of: forming two pairs of parallel longitudinally extending score lines in a continuous web supply the score lines of each being spaced apart a distance equal to the aforementioned satchel bottom width and positioned for forming side corner score lines of the finished bags; forming the web supply so scored into a flattened tube with the score lines of each pair thereof in face-to-face aligned relation, the concavities of one score line of each pair being in face-to-face relation to the concavities of the other score line of such earner scor'e lines along the respective bag tube side margins, "thereafter separating the flattened tube into bag lengths comprising bag tube blanks; and thereafter bottoinlng the bag blanks including: forming transversely of an end region of "each bag tube blank two relatively short score lin'es located intermediate the end edge of the blank and a bottom main line a preselected distance as meastired from such end'edge, one such shortscore line being formed in each of the opposite side marginal areas thereof, said short score lines being in alignment with one another and each extending perpendicularly from its respective side edge to its adjacent and respective side corher some line, each of said short score lines being parallel to the aforementioned bottom main line and the perpendicular distance therebetween being equal to the perpendicular distance between a side corner score line and its adjacent side edge, said short score lines comprising bottom width lines, opening and spreading such end of each such tube blank thereby forming and spreading two bag bottom side flaps and two bag bottom end flaps, said bottom main line being central to the spread tube end, each end flap having its aforementioned bottom width score line formed therein, forming a pair of parallel base fold lines in each of said spread ends extending between and the length thereof being determined by corresponding termini of said parallel bottom width score lines, and thereafter folding said side flaps of each of such bag bottoms over their respective base fold lines and thus one over the other, the convexities of said base fold some lines being formed for protruding outwardly of'the bag bottom 6. In apparatus for forming a satchel bottom bag, the combination including: a bag tuber for forming a succession of flattened bag tubes from a web, such tuber having means for folding and creasing the web along two opposite fold line regions thereby forming same into a flattened tube; scoring means situated in advance of such tube former for forming two pairs of longitudinally extending parallel score lines, each of such pairs being in a fold line region and so positioned that after forming the'tube each score line is equidistant from its respective fold line whichlatter comprises the side edge of the bag tube; means for separating the bag tube into bag lengths after passing through such tube former; each of said bag lengths comprising a bag tube blank; a'bag bottomer for said bag tube blanks for receiving same seriatim and forming consecutively in an end region of each a main score line extending transversely of the bag tube blank and parallel to an end edge thereof, means for forming intermediate said end edge and main score line a pair of relatively short score lines, whereby each of the latter lines is parallel to the aforementioned main score line and located in a side marginal area of the bag tube blank, and each such short score line is situated in a side marginal area which is opposite to that of the other one, and each 'such line extends from its respective side edge perpendicularly to its respective side corner score line, said main score line means and short side line means being constructed and arranged for forming such lines whereby the perpendicular distance between each such short score line and said main score line is equal to the perpendicular distance between a side edge and its respective side corner score line, mean for opening and spreading the end of each bag tube blank about the aforementioned rnain score line thereby spreading two bag bottom side flaps and two bag bottom end flaps, the aforementioned relatively short score lines comprising end flap corner score lines and each being moved substantially into alignment with its respective side corner score line in response to the operation of such opening and spreading of the bag tube end by said opening and spreading means; and means for forming a pair of parallel base fold "score lines in 'each such bag tube end which has been so spread, each such base fold score line ex- '12 tending between and the length thereof being determined by corresponding terminiof said end flap corner fold lines; means for applying adhesive to selected areas of saidspread end; and means for folding saidside flaps one over the other thereby to complete the formation of the satchel bottom bag.

7. In apparatus for forming a satchel bottom bag having a squarablebottom, the combination including: a bag tuber for forming a succession of flattened bag tubes from a plurality of webs, such tuber having means for folding and creasing the web along two opposite fold line regions thereby forming same into a flattened tube; scoring means situated in advance of such tube former for forming two pairs of longitudinally extending parallel score lines, each of such pairs being in atfold line region and so positioned that after forming the tube each score line is equidistant from its respective fold line which comprises the side edge of the bag tube; means for separating the bag tube into bag'lengths after passing through such tube former; each of said bag lengths comprising a bag tube blank; a bag bottomer for said bag tube blanks for receiving same seriatim and forming consecutively in the end region of each a pair of relatively short score lines, each parallel to 'a bottom main line and each such short score line being located in a side marginal area of the bag tube blank, each short score line being situated in a side marginal area which is opposite to that of the other one and each such'line extending from its side edge perpendicularly to its respective side corner score line; means for opening and spreading the end of each bag tube blank about the aforementioned bottom main line thereby spreading two bag bottom side flaps and two bag bottom end flaps, the aforementioned relatively short score lines comprising end fiap corner score lines and each being positioned for moving substantially in alignment with its respective side corner score line in response to the operation of such opening and spreading of the bag tube end by said opening and spreading means; and means for forming a pair of parallel base fold score lines in each such bag tube end which has been so spread, each such base fold score line extending between and the length thereof being determined bycorresponding termini'of said end flap'corner fold lines; means for applying adhesive to selected areas of said spread end, and means for folding said side flaps one over the other thereby to complete the formation of the satchel bottom bag.

8. In the manufacture of bags having satchel'bottoms of a selected width,'tl1e steps of forming in a web two pairs of parallel score lines extending longitudinally of said web, the score lines comprising each pair being spaced apart, as measured on said web, a distance'equal to such bottom width and being positioned for forming side'corner score lines along the'marginal'regions of the finished bag; forming the web so scored into a'flat tube having side and end edges with the score lines of each pair in face-toface aligned relation, thus forming such side'corner score lines along opposite side margins of such fiat tube; forming transversely of the end region of such flat bag tube two'rel-atively short score lines near to but spacedfrom such end edge of the tube. one such short score line being in each of the opposite side marginal regions of thediat tube, such short score lines being in alignment withone another when the tube is flat and each extending'perpendicularly from its respective side edge to its adjacent and respective side corner score line, the perpendicular distan-cc between each such short score line and a'bottom main line, the latter extending transversely of the tube and comprising a reference line for the formation of'the bag bottom, being equal to the perpendicular distance between a side comer score line and the adjacent side edge of the bag tube, the latter being substantially flat, said short score lines comprising end flap corner score lines; opening and spreading such end region of such tube with respect to theafore'rnentione'd bottom main line thereby forming and spreading two bag bottom side flaps and two References Cited in the file of this patent UNITED STATES PATENTS Lorenz Decv 1, 1885 Potdevin Mar. 21, 1916 10 14 Duvall Dec. 16, 1919 Coty Apr. 28, 1936 Karlson July 11, 1944 Haslacher July 11, 1944 Waters Dec. 2, 1947 Hoppe Feb. 8, 1949 FOREIGN PATENTS Sweden Sept. 21, 1954 Germany May 26, 1953 

